linux-kernel - Re: [PATCH Resend] epoll: add EPOLLEXCLUSIVE support

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Date:	Wed, 28 Mar 2012 16:09:24 +0200
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Hagen Paul Pfeifer <hagen@...u.net>
Cc:	torvalds@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Andrew Morton <akpm@...ux-foundation.org>, jbaron@...hat.com,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH Resend] epoll: add EPOLLEXCLUSIVE support

On Wed, Mar 28, 2012 at 3:57 PM, Hagen Paul Pfeifer <hagen@...u.net> wrote:
> High performance server sometimes create one listening socket (e.g. port
> 80), create a epoll file descriptor and add the socket. Afterwards
> create SC_NPROCESSORS_ONLN threads and wait for events. This often
> result in a thundering herd problem because all CPUs are scheduled.
>
> This patch add an additional flag to epoll_ctl(2) called EPOLLEXCLUSIVE.
> If a descriptor is added with this flag only one CPU is scheduled in.
>
> Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net>
> ---
> Dave rejected the patch and said not network specific. Because there
> is no epoll maintainer this time directly.

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-- 
Thanks,
//richard
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